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A transmission line optical fiber channel accelerated remote backup protection method

A backup protection and fiber channel technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of speeding up the short-circuit fault remote backup removal time, shortening the remote backup protection action time, and long remote backup protection action time, etc. Fault clearing time, avoiding adverse effects, effect of accelerating action speed

Active Publication Date: 2020-05-26
CHINA THREE GORGES UNIV
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Problems solved by technology

[0003] In order to solve the problem that the time limit for the remote backup protection action of the power system is too long, the present invention proposes a method for accelerating the remote backup protection through the optical fiber channel of the transmission line. The backup protection acceleration start command starts the remote backup protection of the adjacent line protection device, accelerates the action to trip, shortens the action time of the remote backup protection, and speeds up the short-circuit fault remote backup removal time

Method used

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  • A transmission line optical fiber channel accelerated remote backup protection method
  • A transmission line optical fiber channel accelerated remote backup protection method
  • A transmission line optical fiber channel accelerated remote backup protection method

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specific Embodiment

[0023] 1), in figure 1 In the application example, under normal circumstances, when a short-circuit fault occurs inside the line 2, such as a short-circuit at point K, the protection device 3 of the line 2 starts, the main protection starts and acts instantaneously, and sends a trip command to the circuit breaker QF3, and the circuit breaker QF3 Trip, the fault is removed and eliminated, the fault current disappears, and the protection device returns to normal operation.

[0024] 2) If the protection device 3 can still detect that the current flowing in the line reaches the setting value with the current criterion within a predetermined time after the main protection sends out the trip command, it can be judged that the circuit breaker fails and refuses to operate, and the protection device 3 is issued. While starting the failure protection command, send a remote backup protection acceleration start command to the adjacent upper-level line protection device 2, and the protecti...

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Abstract

According to a power transmission line optical fiber channel acceleration remote backup protection method, when a short-circuit fault occurs inside the line, after a main protection of the line is activated, a trip command is issued to a circuit breaker; when the main protection circuit breaker fails and refuses to act, the main protection sends a remote backup protection acceleration start command to an adjacent line protection device; the adjacent line protection device transmits the remote backup protection acceleration start command to an offside protection device of the line through an optical fiber channel; and after the offside protection device of the line receives the backup protection acceleration start command, the offside protection device of the line starts to accelerate its remote backup protection action and trips off its circuit breaker within the remote acceleration action time limit. The power transmission line optical fiber channel acceleration remote backup protection method of the invention substantially raises the speed of line remote backup protection actions, shortens fault clearing time and is capable of avoiding larger bad influences on short circuit faultsystems and safe and stable operation of devices.

Description

technical field [0001] The invention discloses a transmission line optical fiber channel accelerated remote backup protection method, which belongs to the technical field of power grid relay protection. Background technique [0002] In the power system, stage protection devices such as current protection and distance protection are widely used. When they are used as remote backup protection, the step-by-step principle of step-by-step coordination is used to set the action time limit. In order to ensure selectivity, the rapidity is insufficient. In the level system, the total time and the maximum time of power system fault removal may be too long, making it difficult to ensure the safe and stable operation of the power system and equipment. Contents of the invention [0003] In order to solve the problem that the time limit for the remote backup protection action of the power system is too long, the present invention proposes a method for accelerating the remote backup prot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 黄景光刘胜赵娇娇夏家辉杨鼎罗亭然
Owner CHINA THREE GORGES UNIV
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